I don't think you can just believe authority on account of authority. I'd wait and see what evidence if any they can produce about Russia being involved. As of right now, it's just finger pointing.
I'm a little hesitant to agree with this statement because it seems like the stock hypocrisy i see a lot of.
There are some people here who, in the case of an unarmed black teen being shot or some stuff, they say "the cop had the right to do it / he should've complied / it was justified" which is essentially saying that authority has the power to take lives without any punishment. these same people go on to bash others for believing in the government and say things along the lines of "the government has too much power! / its corrupt!"
Honestly, the government and authority are more credible than websites like wikileaks or opinion news sites like fox. Despite the fact that wikileaks claims all of their things are actual leaked documents, they aren't a credible source of information. Right now we need evidence and studies that prove it, not fingerpointing and counter-fingerpointing. If the CIA suggests that something is fact but doesn't confirm it, then it's not fact, but speculation. Right now this is just speculation, but is more than just fingerpointing.